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Equations to usemoles = mass/Mrmoles= concentration*volumeAr of Magnesium = 12 Moles= 0.096/12 Moles=0.008Moles of HCL = 25/1000 x 0.4=0.1Therefore HCL is in excess

The mass number defines the number of protons and neutrons in an atom. The atomic number shows the number of protons in an atom (nucleus). Because there is the same number of protons as e...

A reducing agent is oxidized. This means that it donates electrons to another substance, thus reducing it. Fe2+ to Fe3+ represents oxidation. Fe2+ could be a reducing agent.

The size of atomic radius increases down the group but decreases from left to right across the period. Atomic radius is defined by the distance of protons in nucleus to surrounding electron shells. Mainly...

As you go down the group:shielding increases as electron numbers increase, this means that the distance between the nucleus and outer electron is further and attraction is weaker between the positive nucl...